4 2 - y + 3*y + 4
-y^4 + 3*y^2 + 4
4 2 4 - y + 3*y
4 - y^4 + 3*y^2
(x + 2)*(x - 2)*(x + I)*(x - I)
(((x + 2)*(x - 2))*(x + i))*(x - i)
4.0 - y^4 + 3.0*y^2
/ 2\ -\1 + y /*(-2 + y)*(2 + y)
-(1 + y^2)*(-2 + y)*(2 + y)
2 / 2\ 4 + y *\3 - y /
4 + y^2*(3 - y^2)